<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>Document</title>
  <!-- 导入页面的基本样式 -->
  <link rel="stylesheet" href="./css/search.css" />
  <!-- 导入 jQuery -->
  <script src="./lib/jquery.js"></script>
  <script src="./lib/template-web.js"></script>
</head>

<body>
  <div class="container">
    <!-- Logo -->
    <img src="./images/taobao_logo.png" alt="" class="logo" />

    <div class="box">
      <!-- tab 栏 -->
      <div class="tabs">
        <div class="tab-active">宝贝</div>
        <div>店铺</div>
      </div>
      <!-- 搜索区域（搜索框和搜索按钮） -->
      <div class="search-box">
        <input type="text" class="ipt" placeholder="请输入要搜索的内容" /><button class="btnSearch">
          搜索
        </button>
      </div>
      <!-- 搜索建议列表 -->
      <div id="suggest-list"></div>
    </div>
  </div>
  </div>

  <!-- 模板结构 -->
  <script type="text/html" id="tpl-suggestList">
    {{each result}}
      <!--搜索建议项-->
      <div class="suggest-item">{{$value[0]}}</div>
    {{/each}}
  </script>


  <script>

    let timer = null;
    const cacheObj = {};
    function debounceSearch(kw) {
      timer = setTimeout(function () {
        getSuggestionsList(kw);
      }, 500)
    }

    $('.ipt').on('keyup', function () {
      clearTimeout(timer);
      let keywords = $(this).val().trim();
      if (keywords.length <= 0) {
        return $('#suggest-list').empty().hide();
      }

      // 优先从缓存中获取搜索建议
      if (cacheObj[keywords]) {
        return renderSuggestList(cacheObj[keywords])
      }
      // console.log(keywords)
      // getSuggestionsList(keywords);
      debounceSearch(keywords)
    });


    function getSuggestionsList(kw) {
      $.ajax({
        url: 'https://suggest.taobao.com/sug?q=' + kw,
        dataType: 'jsonp',
        success: function (res) {
          // console.log(res);
          renderSuggestionsList(res);
        }
      })
    };

    function renderSuggestionsList(res) {
      if (res.result.length <= 0) {
        return $('#suggest-list').empty().hide();
      }

      // 将搜索的结果，添加到缓存对象中
      let k = $('.ipt').val().trim()
      cacheObj[k] = res

      const htmlStr = template('tpl-suggestList', res);
      $('#suggest-list').html(htmlStr).show();

    }
  </script>
</body>

</html>